Since Flannigan's death at The House of Blues in Boston and two suspected non-fatal Molly overdoses at the Bank of America Pavilion concert Saturday, police say a crackdown is under way.

"There's going to be stepped up surveillance of these venues that this stuff is used in -- nightclubs, concerts -- we're going to do a significant amount of undercover work. We've already made four or five arrests in the past week," Boston Police Commissioner Ed Davis said.

Police said anyone caught selling a drug that leads to an overdose could face manslaughter charges.

There were also two deaths during the weekend at a New York City music festival.

"It's becoming a real problem. It's worrisome because it is the start of school," Davis said.

Molly is the street name for the club drug MDMA -- considered a pure form of ecstasy.

"There's no such thing as pure ecstasy. These guys are mixing ecstasy in bathtubs. Common sense would dictate that when someone hands you something you don't know what it is, why would you take it?" Pettigrew said.

Authorities are urging parents to talk to their kids about the dangers of the drug.

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